A309361 - cp's OEIS frontend

A309361 Numbers n such that the number of interior intersection points A091908(n) of the n-intersected triangle increases exactly by 1 when the subdivision of the triangle is refined from n-1 to n cutting line segments.

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	17
9	21
10	25
11	27
12	31
13	33
14	37
15	43
16	49
17	51
18	53
19	55
20	57
21	61
22	67
23	73
24	81
25	93
26	97
27	101
28	107
29	113
30	115
31	121
32	123
33	127
34	133
35	137
36	141
37	145
38	147
39	157
40	163
41	173
42	177
43	183
44	185
45	193
46	201
47	205
48	211
49	213
50	217
51	235
52	241
53	243
54	249
55	253
56	257

[1, 3, 5, 7, 9, 11, 13, 17, 21, 25, 27, 31, 33, 37, 43, 49, 51, 53, 55, 57, 61, 67, 73, 81, 93, 97, 101, 107, 113, 115, 121, 123, 127, 133, 137, 141, 145, 147, 157, 163, 173, 177, 183, 185, 193, 201, 205, 211, 213, 217, 235, 241, 243, 249, 253, 257]

cp's OEIS Frontend

A309361 Numbers n such that the number of interior intersection points A091908(n) of the n-intersected triangle increases exactly by 1 when the subdivision of the triangle is refined from n-1 to n cutting line segments.

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	17
9	21
10	25
11	27
12	31
13	33
14	37
15	43
16	49
17	51
18	53
19	55
20	57
21	61
22	67
23	73
24	81
25	93
26	97
27	101
28	107
29	113
30	115
31	121
32	123
33	127
34	133
35	137
36	141
37	145
38	147
39	157
40	163
41	173
42	177
43	183
44	185
45	193
46	201
47	205
48	211
49	213
50	217
51	235
52	241
53	243
54	249
55	253
56	257

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	17
9	21
10	25
11	27
12	31
13	33
14	37
15	43
16	49
17	51
18	53
19	55
20	57
21	61
22	67
23	73
24	81
25	93
26	97
27	101
28	107
29	113
30	115
31	121
32	123
33	127
34	133
35	137
36	141
37	145
38	147
39	157
40	163
41	173
42	177
43	183
44	185
45	193
46	201
47	205
48	211
49	213
50	217
51	235
52	241
53	243
54	249
55	253
56	257

n	a(n)
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	17
9	21
10	25
11	27
12	31
13	33
14	37
15	43
16	49
17	51
18	53
19	55
20	57
21	61
22	67
23	73
24	81
25	93
26	97
27	101
28	107
29	113
30	115
31	121
32	123
33	127
34	133
35	137
36	141
37	145
38	147
39	157
40	163
41	173
42	177
43	183
44	185
45	193
46	201
47	205
48	211
49	213
50	217
51	235
52	241
53	243
54	249
55	253
56	257